From: Christoph Hellwig <hch@lst.de>
To: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 6/6] ide: Avoid canceling IDE DMA
Date: Fri, 18 Mar 2011 12:19:41 +0100 [thread overview]
Message-ID: <20110318111941.GA25520@lst.de> (raw)
In-Reply-To: <1280846670-27063-7-git-send-email-kwolf@redhat.com>
On Tue, Aug 03, 2010 at 04:44:30PM +0200, Kevin Wolf wrote:
> Furthermore because the DMA operation is splitted into many synchronous
> aio_read/write if there's more than one entry in the SG table, without this
> patch the DMA would be cancelled in the middle, something we've no idea if it
> happens on real hardware too or not. Overall this seems a great risk for zero
> gain.
That hasn't been true for a long time when this code was commited, at least
on kernel supporting preadv/pwritev and/or aio.
next prev parent reply other threads:[~2011-03-18 11:19 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-03 14:44 [Qemu-devel] [PULL 0/6] Block patches Kevin Wolf
2010-08-03 14:44 ` [Qemu-devel] [PATCH 1/6] block: Change bdrv_commit to handle multiple sectors at once Kevin Wolf
2010-08-03 14:44 ` [Qemu-devel] [PATCH 2/6] loadvm: improve tests before bdrv_snapshot_goto() Kevin Wolf
2011-04-14 9:10 ` [Qemu-devel] [BUG] Re: [2/6] " Philipp Hahn
2011-04-14 9:29 ` Kevin Wolf
2011-08-09 22:35 ` [Qemu-devel] [libvirt] " Eric Blake
2010-08-03 14:44 ` [Qemu-devel] [PATCH 3/6] block migration: replace tabs by spaces Kevin Wolf
2010-08-03 14:44 ` [Qemu-devel] [PATCH 4/6] block: Fix bdrv_has_zero_init Kevin Wolf
2010-08-03 14:44 ` [Qemu-devel] [PATCH 5/6] block: Change bdrv_eject() not to drop the image Kevin Wolf
2010-08-03 14:44 ` [Qemu-devel] [PATCH 6/6] ide: Avoid canceling IDE DMA Kevin Wolf
2011-03-18 11:19 ` Christoph Hellwig [this message]
2011-03-18 11:34 ` Kevin Wolf
2011-03-18 14:10 ` Christoph Hellwig
2010-08-09 13:41 ` [Qemu-devel] [PULL 0/6] Block patches Anthony Liguori
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